Jonny Heinkenwrote a review of Zipp SL Speed Carbon Stem on August 4, 2017
This is the *new* Zipp SL Speed carbon stem (with new stealth graphics).
Zipp, undeniably, one of the very best carbon road wheelset makers in the world... has quietly become one of the very best makers of carbon cockpit components.
The SL Speed carbon stem is expensive. It is strong. It is light (Zipp says 123g in size 100mm).
It is also stunnigly beautiful in stealth matte carbon black (and will match any frame color)
American company/design. Cool.
By the way, Zipp uses Torx fasteners because they are "simply a better bolt." As Zipp explains, "They are more durable (strip less). And they provide more accurate torque readings."
Install note: This stem is a work of art. You must use a quality torque wrench (or one of Park's excellent new torque keys @ $45) to tighten the bolts (cross X) to spec (6 Nm max torque).
If you have a carbon bar, add a swipe of grip paste ( I rec Finish Line, $7/tube). Don't over tighten. And you don't need to if you use a torque key and grip paste.